Safety Ear Plugs (Pack of 3)Advanced technology to cancel noise and manage sound in some of the worlds most acoustically challenging environments. Reduce Harmful Noises. Boost Hearing Protection and Comfort Unlike most other occupational health and safety injuries, Noise Induced Hearing Loss (NIHL) is pain free, invisible, usually gradual, and, therefore, often goes unnoticed until the damage is done. Though it is one of the most prevalent occupational disease in the world, NIHL